PREMIUM QUALITY: High-quality white corundum material, SHAN ZU sharpening stones are so abrasion-resistant, corrosion-resistant, heat-resistant, that make it can be used for a long time and uses ONLY WATER, no expensive grinding oil needed. SUPERIOR SET: The whetstone is combined with the grit 400/1000 and the grit 3000/8000. SIZE AND USAGE: The size of kife sharpener is 180x60x27mm, and it should be immersed in water for about 5 minutes before using. A grinding angle of 15-20 degrees is perfect, and keep that angle during the whole sharpening process. The Knife Sharpening Angle Guide will put your blade on the optimal angle for you and protect your fingers throughout the sharpening process. SUITABLE FOR MOST KNIVES: Professional grade knife sharpener doesnt only work its magic on kitchen and chef knives, its versatility extends to virtually any blade Sharpen fillet knives,sushi knives,pruners,straight razor blades,scissors,axes,Hunting Knives and more.